Just tried something I remember my mum had told me and found some random notes on a website about it....
- halve a lemon
- squeeze half into 1 glass of water
- do that again (2 glasses)
- pour into your kettle
Let the kettle cool right down, including the element of course, and empty. If there is any scum left then wipe through with a small amount of bicarbonate of soda and a damp cloth. Rinse several times before using again.
Sooooooo good, no chemicals really required if you do this regularly instead of allowing the build up.
Really pleased. Simple.